Plugin messaging not working

Hi
I need to send information from my paper server to velocity. I have registered my channel in velocity and exactly the same in paper, but for some reason, the PluginMessageEvent event in Velocity never triggers. What is the reason for this behavior?

Velocity side: https://www.toptal.com/developers/hastebin/yoxaregofo.kotlin
Paper side: https://www.toptal.com/developers/hastebin/capemupipa.csharp
velocity config: https://www.toptal.com/developers/hastebin/ejuqicemog.ini